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| Criterion |  Architecture Architecture Decision Record |  Operations DMAIC |  Operations 5 Whys |  Operations Root Cause Analysis |
|---|---|---|---|---|
Purposedifferent | An ADR permanently records an architecture decision with context, trade-offs, and consequence. It creates continuity for later changes because the decision path stays traceable. | For a process problem with fluctuating performance, the method brings analysis and improvement into a disciplined sequence. It creates a framework in which numbers, causes, and control come together. | For a single, hard-to-explain deviation, the method exposes the causal chain behind the visible symptom. It keeps the cause open until a controllable condition emerges instead of a mere description. | When a problem keeps recurring and the cause stays unclear, the method exposes the underlying mechanism. It separates symptom, guess, and robust explanation from one another. |
Complexitydifferent | Low | High | Low | Medium |
Timedifferent | 15-45 min | 2-12 Wochen | 15-30 min | 1-4 h |
Participantsdifferent | 1-3 | 3-10 | 2-6 | 3-8 |
Formatdifferent | Async | Workshop + async | Workshop | Workshop + async |
Outputdifferent | ADR File, Decision Log, Rationale | Project Charter, Measurement Plan, Cause Analysis, Control Plan | Root cause notes, Countermeasures | Problem Statement, Cause Hypotheses, Confirmed Causes, Action Plan |
Tagsno overlap | ArchitectureRationaleDocumentationGovernance | Continuous improvementQualityProcess improvement | Root causeIncidentLeanProblem solving | Root causeProblem solvingQualityIncident |